For ABPBI low temperature casting membrane preparation, a
solution of 1 wt% ABPBI in formic acid was poured in a Teflon mold
and the formic acid was evaporated overnight in a ventilated hood
at room temperature. The membrane was easily removed from
the mold. Finally all the ABPBI membranes were doped in 10.64 M
H3PO4 for 72 h to protonate the imidazole ring.